Answer:
23
Explanation:
46 unreplicated chromosomes- called daughter chromosomes - each one is essentially a chromatid. The parent cell had 46 double chromosomes (2 chromatids each) - which split into two in mitosis. This means that we need to divide 46 by 2 and we get 23.
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Prothallus represents a gametophyte in the life cycle of fern.
A prothallium, or prothallus<span> (from Latin pro = forwards and Greek θαλλος (thallos) = twig) is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally the term is also used to describe the young gametophyte of a liverwort or peat moss as well.
so the answer should be prothallus</span>
Answer:
A change occurs in the environment.
Poorly adapted individuals have decreased survivorship.
Well-adapted individuals leave more offspring than do poorly adapted individuals.
Genetic frequencies within the population change.
Explanation:
Natural selection is a mechanism for the evolution of populations under the changed climatic conditions. The presence of genetic variations is a required factor for natural selection. As the conditions of habitat are changed, some of the genetic traits become more beneficial for individuals than the other.
The individuals of the population with beneficial adaptive traits have increased survival and reproductive success. On the other hand, the individuals that lack those adaptive genetic traits have reduced survival. Individuals with increased survival success leave more progeny. Over generations, a new population evolves that has the most number of individuals with beneficial genetic traits.
Deoxyribose sugar + phosphate group + thymine
Because Uracil and ribose are unique to RNA and not DNA